Rear shutter housing for motion picture projectors



J. A. KRuLlsH 2,211,830

F-ile'ld July 16, `1938 2 Sheets-Sheet l Aug. 20, 1940.

REAR SHUTTER HOUSING FOR MOTION PICTURE PROJECTORS t mf J. A. KRULISH Aug. 20, 1940.

REAR SHUTTER HOUSING FOR MOTION PICTURE PROJECTORS Filed July 16, 1938 2 Sheets-Sheet 2 llIIIlIIIIIIllllllIIIIIIIIIIIIIIIIIW IIIIIIII||||||IlIIIIIIIIIIIIIIIIHIIIIW 11W/EN TOR. John /fru/l'sh BY www@ A T TORNEYS.

Patented Aug. 20, 1940 UNITED STATES PATENT OFFICE REAR SHUTTR HOUSING FOB MOTION PICTURE PROJECTORS Antimafia July ie, i928, serial No. 219,586

'l Claims.

As is well known, motion picture projectors are provided with rotating shutters adapted to intermittently. cut oii the beam of light from a lamphouse, which beam of. light passes through the projector and through the film which is intermittently fed through the projector. The lamp house where the beam of light originates is very r heavy and heretofore great difficulty has been experienced when it was necessary to remove the guard or the housing from the rear shutterv because of the fact that the lamp house is irrimediately behind the same. This necessitated the laborious process of moving the lamp house before the rear shutter housing could be removed. The object of this invention yis to eliminate this diiii- .culty by making the housingy in two sections,

either of which sections may be removed laterally without disturbing the lamp house.

Other objects and advantages of the invention will appear in the detailed ,specification and claims which follow.

The invention may ce better understood by referring to the attached drawings forming a part thereof in which,

Fig. 1 is a vertical side elevational view of a projector' partly in cross sectionand my improved rear shutter housing mounted thereon, and

Fig. 2 is a view of the rear face of the rear shutter housing looking forwardly of the projector or from the right lto the left as viewed in Fig. 1.

The projector I is provided with a rotating shuttervshaft V2 provided with a front shutter 3 and a rear shutter 4. Secured to the projector is a frame consisting of an upwardly extending arm 5, a downwardly extending arm 6 and an arm 'I extending laterally in substantially the same horizontal plane as the shaft 2. The armv 5 carries a pin 8 which is secured in position by means of a screw 9. The downwardly extending arm 8 is provided with a pin Ill which pin also extends forwardly and is secured to the rear wall of the projector as is clearly shown in Fig. l. The arms 5, 6, and l have secured thereto a plate II which is circular except that it is cut away adjacent the rectangular exposure aperture I2 so that light can pass through the said aperture. This plate II might be considered Vas the front part of the housing, but for the purposes of this description the said plate I I is excluded and the housing is considered as the two removable sections which will now be described.

The housing consists of a semi-circular section I3 and a semi-circular section I4. The semicircular section I3 is provided with a semi- (Cl. 88-ll9.3)

circular central aperture I5 and the semi-circular section Nl is provided with a similar aperture I6, the two said apertures t5 and I6 forming a central hole through which the shaft 2 projects. The section I 3 is secured to the arm I by means of the bolt il. At its upper end adjacent the diametrical face I8 it is provided with an upstanding ear i8 provided with a semi-circular bore 2U. rihe downwardly extending ear 2l is provided with a similar bore. The semi-circular section I4 is provided with an upstanding ear 22 and a downwardly extending ear 23. The ears 22 and 23 are constructed as the ears I9 and 2l except that they are oppositely facing so that the ears I8 and 22 might be considered as upwardly ex- .15 tending mating ears and the two semi-circular portions would form a circle when the two sections are brought together around the pin 8.

Similarly the two downwardly extending ears 2l Vthrough which the light passes from the lamp house 28. It is to be noted that the lamp house is immediately adjacent the light shield so that the section i4 cannot be moved rearwardly without moving the lamp house.

1n order to connect these two sections of the housing together so that the face I8 of the section i3 will abut against the face 2'I of the section iii, the operator will move the Vtwo sections together laterally so that the pins 8 and IIJ will be received in the respective semi-circular apertures in the ears. The screw 28 should then be passed through a hole 28 in the ear I9 and screwed into screw threads in the bore 30 in the ear 22. As will be noted, the screw 28 is above the pin 8. A similar screw is used below the pin I3 to connect the downwardly extending ears to- 40 gether. The pin 8 is provided with a threaded bore 3l, which receives a screw 32 which passes through a bore 33 in the ear I9, thereby securing the ear I9 to the said pin 8. The screw 34 passes through a similar bore in the ear 22 and is 45 screwed into the bore 3| thereby securing the ear 22 to the pin 8. The ears 2l and 23 are similarly secured to the pin I0.

It will be noted that if the operator desires to remove the section I4 he will unscrew the upper 0 and lower screws 28 and then will unscrew the two upper and lower screws 34, thereby freeing the section I4 so that he can move it laterally without disturbing the lamp housing. If he also 55 desires to move the section i3 he can remove it in the same manner after releasing the bolt l1.

I have, therefore, provided a practical rear shutter housing made in two sections, either or both o1 which may be removed without disturbing the lamp housing.

In some cases the lamp house may actually project a short'distance within the shield 24 but in such a case no trouble is experienced in removing or reassembling the housing for when the fastening means are removed the right hand side of the section I4, as viewed in Fig. 2, may be tilted slightly forwardly so that the shield 2li no longer receives any portion of the lamp housing and the section I4 may then be moved laterally to remove it from the projector.

I realize that many c-hanges may be made in the specific form of the invention as illustrated by way of example in this application, and I therefore reserve the right to make all changes which may fairly fall within the scope of the following claims. Y

Having now described my invention, I claim:

, 1.A In a motion picture projector, a rear shutter, a rotatable shaft on which said shutter is secured, a circular housing for said shutter radially split to make two sections, supporting means carried by said projector and independent means to secure` each of said sections to said supporting means so that either of said sections when said means are released may be independently and laterally removed.

V 2. In a motion picture projector arear shutter, a rotatable shaft on which said shutter is secured, a circular housing for said shutter radially split to make two sections, supporting means carried by said projector, each of said sections being provided with a semi-circular central hole through which said shaft projects and independent means to secure eac-h of said sections to said projector so that either of said sections when said means are released may be independently and laterally removed.

3. Ina motion picture projector, a rear shutter, a rotatable shaft on which said shutter is secured, a -housing for said shutter made in two semicircular sections, two supporting arms carried by saidy projector, a pin carried by each of said arms, and means to secure each of said sections to said pins so that either of said sections when said moved.

4. In a motion picture projector, a rear shutter,

a rotatable shaft on which said shutter is secured., a housing split into two semi-circular sections, two fixed pins carried by said projector, one of said pins being above and the other below said shaft, ears on the extreme upper and lower ends of each of said sections adjacent the said split and adapted to receive said pins when the sections are put together, thereby forming two sets of mating ears and means to secure'each of said sections independently on said pins.

5. In a motion picture projector, a rear shutter, a rotatable shaft on which said shutter is secured, a housing split into twosemi-circular sections, two fixed pins carried by said projector, one of said pins being above and the other below said shaft, ears on the extreme upper and lower ends of each of said sections adjacent the said split and adapted to receive said pins when the sections are put together, thereby forming two sets of mating ears, means to secure each of said sections independently on said pins, and other means to secure the mating ears together.

6. In a motion picture projector, a rear shutter, a rotatable shaft on which said shutter is secured, a housing split into two semi-circular sections, two iixed pins carried by said projector, one of said pins being above and the other below said shaft, ears on the extreme upperand lower ends of each of said sections adjacent the said split and adapted to receive said pins when the sections are put together, thereby forming two sets of mating ears, a screw for each ear adapted to be screwed partly into its corresponding pin, and a screw adapted to pass through the mating ears to secure said sections together.

7. In a motion picture projector, a rear shutter,

a housing therefor made in two mating sections, a lamp house positioned immediately behind said housing, each of said sections being provided with an upwardly and a downwardly extending ear and so positioned that when the sections are brought laterally together, the two upwardly extending ears will mate and the two downwardly extending ears will mate, rearwardly extending pins carried by said projector and adapted to pass through mating semi-circ-ular holes in said ears, and laterally extending screws passing through said ears so that when said sections are moved together laterally without disturbing` the lamp house, said screws may be screwed through said ears and into said pins carried by the said pro- J'ector.

JOHN A. KRULISH. 

